EUVD-2026-67930Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable with no authentication or user interaction; impact is pure process-kill availability with no confidentiality or integrity effect.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
multer is a middleware for handling multipart/form-data in Node.js. A small multipart request containing two specially crafted text field names can cause an uncaught RangeError (Invalid array length) that terminates the Node.js process. The first field uses a very large numeric array index to allocate a maximum-length sparse array, and a second field then pushes past that length, which throws inside the append-field dependency and is not caught by multer. All versions before 2.3.0 are affected, and the issue is a remotely triggerable denial of service. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
Articles & Coverage 1
AnalysisAI
Remote denial-of-service in the Node.js multer middleware (all versions before 2.3.0) allows unauthenticated attackers to crash the entire Node.js process by submitting a small, specially crafted multipart/form-data request. The attack exploits an uncaught RangeError in multer's append-field dependency: a first field with an extremely large numeric index allocates a maximum-length sparse array, and a second field pushes past that limit, throwing an exception that multer does not catch. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special configuration or non-default setup is required: any application that uses multer versions before 2.3.0 to process multipart/form-data on a network-accessible endpoint is exploitable by unauthenticated attackers (CVSS PR:N, AV:N, AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately reflects the vulnerability's characteristics: network-accessible, no authentication, no user interaction, and low attack complexity producing high availability impact with no confidentiality or integrity compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade multer to version 2.3.0 or later; this is the only complete fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, execute a complete inventory scan of all production and staging Node.js applications to identify those running multer versions prior to 2.3.0, using both dependency scanners and runtime introspection. …
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Same weakness CWE-248 – Uncaught Exception
View allSame technique Denial Of Service
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External POC / Exploit Code
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